Police say the pool was surrounded by a fence, but was accessible from the back door of the home..
A pool cleaning man found the boy shortly after 12 o'clock and called 9-1-1.
There's no word yet on how long the youngster may have been in the water.
The child's mother was in the house at the time.
Paramedics rushed the child to Crozer-Chester Medical Center, where he was pronounced dead.
